9.4 Screw joints
General
This section describes how to tighten the various types of screw joints on ABB
robots.
The instructions and torque values are valid for screw joints comprised of metallic
materials and do not apply to soft or brittle materials.
UNBRAKO screws
UNBRAKO is a special type of screw recommended by ABB for certain screw joints.
It features special surface treatment (Gleitmo as described below) and is extremely
resistant to fatigue.
Whenever used, this is specified in the instructions, and in such cases, no other
type of replacement screw is allowed. Using other types of screws will void any
warranty and may potentially cause serious damage or injury.
Gleitmo treated screws
Gleitmo is a special surface treatment to reduce the friction when tightening the
screw joint. It is recommended by ABB for M6-M20 screw joints. Screws treated
with Gleitmo may be reused 3-4 times before the coating disappears. After this the
screw must be discarded and replaced with a new one.
When handling screws treated with Gleitmo, protective gloves of nitrile rubber
type should be used.
Generally, screws are lubricated with Gleitmo 603 mixed with Geomet 500 or
Geomet 702 in proportion 1:3. Geomet thickness varies according to screw
dimensions, refer to the following.
Geomet thicknessLubricantDimension
3-5 μmGleitmo 603 + Geomet 500M6-M20 (any length except
M20x60)
3-5 μmGleitmo 603 + Geomet 720M6-M20 (any length except
M20x60)
8-12 μmGleitmo 603 + Geomet 500M20x60
6-10 μmGleitmo 603 + Geomet 720M20x60
Screws lubricated in other ways
Screws lubricated with Molykote 1000 or Molykote P1900 should only be used
when specified in the repair, maintenance or installation procedure descriptions.
In such cases, proceed as follows:
1 Apply lubricant to the screw thread.
2 Apply lubricant between the plain washer and screw head.
3 Screw dimensions of M8 or larger must be tightened with a torque wrench.
Screw dimensions of M6 or smaller may be tightened without a torque wrench
if this is done by trained and qualified personnel.
Continues on next page
320 Product manual - IRB 1010
3HAC081964-001 Revision: B
© Copyright 2022 ABB. All rights reserved.
9 Reference information
9.4 Screw joints
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